JP2531245B2 - Initialization method and device for phase-change optical disk - Google Patents

Description

The present invention relates to a phase-change optical disk initialization method and device, and more particularly to a phase-change optical disk initialization method capable of collectively initializing the entire recording surface. And equipment.

[Conventional technology]

When recording or initializing a phase-change optical disc, the conventional initialization device for phase-change optical disc has a reflectance of an amorphous phase and a reflectance of an amorphous phase on the recording surface. The difference was used to record and initialize the signal information.

Next, a conventional phase change type optical disk initialization method and apparatus will be described in detail with reference to the drawings.

 FIG. 6 is a side view showing a conventional example.

The phase-change type optical disk initialization device shown in FIG. 6 is configured to include a semiconductor laser and a cylindrical lens.

Here, the laser light emitted from the semiconductor laser 11 becomes parallel light by the condenser lens 12, and then passes through the cylindrical lens 13 to become an elliptical shape having a long axis with respect to the rotation direction of the phase-change optical disk 1. The light passes through the objective lens 14 and enters the recording surface 1 of the phase-change optical disc 1. Of the recording surface 2 of the phase-change optical disk 1, only the portion irradiated with the laser light is heated to the crystallization temperature by the thermal energy of the laser light. Since the phase-change optical disk 1 is rotated by the motor 21 and the portion irradiated with the laser light moves to the position of the other end on the recording surface 2, the portion heated to the crystallization temperature is irradiated with the laser light. The heat energy is lost and the material is gradually cooled to crystallize the atoms constituting the recording surface and the initialization is completed.

Next, recording and initialization of the phase change type optical disk shown in FIG. 6 will be described with reference to the drawings.

FIGS. 7A and 7B are graphs showing the recording state and the initializing state of the recording surface of the phase change type optical disc shown in FIG.

The recording operation on the recording surface 2 shown in FIG. 7A is performed by irradiating the recording surface 2 of the crystalline phase with intense light for a short time so that the atoms on the recording surface heated above the melting point become liquid. Then, by rapidly cooling, the atomic arrangement is solidified in a liquid state and becomes an amorphous phase.

Further, in the initialization operation for the recording surface 2 shown in FIG. 7B, the atoms on the recording surface 2 which have been heated to the crystallization temperature or higher by irradiation of light are gradually cooled, and the atomic arrangement becomes a crystalline phase. It is done by Information is recorded and initialized by utilizing the fact that the crystalline phase has a higher reflectance than the amorphous phase shown in FIG. 7 (a).

Therefore, it is necessary to initialize the recording surface of the phase-change optical disk in advance when recording information on the phase-change optical disk.

[Problems to be Solved by the Invention]

However, since the above-described conventional initialization method and apparatus for a phase-change optical disk perform initialization using a focused beam of a semiconductor laser, a small area of the recording surface on the phase-change optical disk is used. , For example,
Since the configuration is such that 1 to 2 μm ² is continuously initialized, there is a disadvantage that it takes a long time to initialize the entire recording area of the phase change optical disk.

[Means for solving the problem]

The initialization method and apparatus for a phase-change optical disc of the present invention removes the radiant heat from the phase-change optical disc after heating the radiant heat of a heat source lamp over the entire recording surface of the phase-change optical disc to a crystallization temperature or higher. By doing so, the recording surface of the phase-change optical disk is gradually cooled so that the atomic arrangement on the recording surface becomes a crystalline phase, and the heat source is arranged at a position to irradiate the entire recording surface of the phase-change optical disk. It is configured to include a lamp and a removing unit that removes the radiant heat from the phase change optical disk.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

 FIG. 1 is a side view showing a first embodiment of the present invention.

The phase-change optical disk initialization device shown in FIG. 1 includes a xenon lamp 5 arranged at a position for irradiating the entire recording surface 2 of the phase-change optical disk 1, and the xenon lamp 5.
It is configured to include an elevator 7 that moves along the pole 8.

Next, the operation and operation of the embodiment shown in FIG. 1 will be described in detail.

The xenon lamp 5 arranged at a position for irradiating the entire recording surface 2 of the phase change type optical disc 1 is always lit,
Radiant heat a is applied to the recording surface 2.

The xenon lamp 5 is interlocked with the elevator 7 that moves along the pole 8 to change the distance between the xenon lamp 5 and the recording surface 2.

The recording surface 2 is gradually heated by the radiant heat a provided by the xenon lamp 5, and finally exceeds the crystallization temperature.

Then, the xenon lamp 5 rises as the elevator 7 moves up, and the recording surface 2 stops at a position where the radiant heat a given from the xenon lamp 5 and the radiant heat emitted from the recording surface 2 coincide with each other. Maintains a temperature above the crystallization temperature.

Then, the xenon lamp 5 gradually rises as the lifting operation of the elevator 7 is restarted, and reaches the recording surface 2.

As a result, the radiant heat a is gradually reduced, and the recording surface 2 is gradually cooled.

Next, the operation of the embodiment shown in FIG. 1 will be described in more detail with reference to the drawings.

FIG. 2 is a graph explaining the operation of the embodiment shown in FIG.

As the distance between the phase-change optical disk 1 and the xenon lamp 5 changes, the temperature of the recording surface changes due to the difference between the radiant heat a given to the recording surface 2 by the xenon lamp 5 and the radiant heat emitted from the recording surface 2.

Initialization of a rewritable phase-change optical disk with a diameter of 130 mm was performed using the phase-change optical disk initialization device shown in Fig. 1. After irradiation with a xenon lamp power of 1 KW for 60 seconds, the xenon lamp was irradiated. Raise an additional 30
After irradiation for a second, the phase-change optical disk was completely initialized by further raising the xenon lamp at a speed of 10 mm per second.

Next, a second embodiment shown in FIG. 3 will be described with reference to the drawings.

The phase change type optical disc initializing apparatus shown in FIG. 3 includes a xenon lamp 5 arranged at a position for irradiating the entire recording surface 2 of the phase change type optical disc 1 and the phase change type optical disc 1.
Is moved to a position right below the xenon lamp 5 and further conveyed out from a position right below the xenon lamp 5.

Next, the operation and operation of the embodiment shown in FIG. 3 will be described in detail.

The phase-change type optical discs 1 arranged on the conveyor 9 are conveyed in accordance with the driving of the conveyer 9 arranged just below the xenon lamp 5.

As the conveyor 9 is driven, the phase-change optical disk 1
Comes close to the xenon lamp 5, and the recording surface 2 is gradually heated by the radiant heat a from the xenon lamp 5 and exceeds the crystallization temperature in the vicinity of the xenon lamp 5. further,
By driving the conveyor 9, the phase-change optical disk 1 passes directly under the xenon lamp 5, and the temperature of the recording surface 2 is kept higher than the crystallization temperature. After that, the phase-change optical disk 1 is moved away from the xenon lamp 5 by the conveyor 9,
Since the radiant heat a applied to the recording surface 2 is gradually reduced, the recording surface 2 is gradually cooled.

Next, the operation of the embodiment shown in FIG. 3 will be described in more detail with reference to FIG.

Since the distance between the xenon lamp 5 and the recording surface 2 of the phase-change optical disk 1 changes as the conveyor 9 is driven, the radiant heat a given from the xenon lamp 5 to the recording surface 2 and the radiant heat emitted from the recording surface 2 are diverged. The temperature of the recording surface changes due to the difference.

Initialization of a rewritable phase-change optical disk with a diameter of 130 mm was performed using the phase-change optical disk initialization device shown in FIG. 3, and the xenon lamp input power was 1 KW.
The phase-change optical disc was completely initialized at a conveyor transport speed of 1 mm / sec.

Next, the third embodiment shown in FIG. 5 will be described in detail.

The initialization device for phase-change type optical disk shown in FIG. 5 controls the xenon lamp 5 arranged at a position for irradiating the entire recording surface 2 of the phase-change type optical disk 1, and the irradiation time and irradiation light amount of the xenon lamp 5. And a power supply device 6 having a control unit for controlling.

Next, the operation and operation of the embodiment shown in FIG. 5 will be described in detail.

The xenon lamp arranged at a position for irradiating the entire recording surface 2 of the phase-change optical disk 1 is turned on by the power supply device 6 and gives radiant heat a to the recording surface 2.

The amount of radiant heat given to the recording surface 2 per unit time is controlled by changing the irradiation light amount of the xenon lamp 5 by changing the electric power supplied from the power supply device 6 to the xenon lamp 5, and the energization time can be changed. The irradiation time is controlled by.

The recording surface 2 is gradually heated by the radiant heat a from the xenon lamp 5, and finally exceeds the crystallization temperature.

Xenon lamp 5 that has been lit for a certain time by the power supply device 6
Turns off, but the xenon lamp 5 still has preheating after turning off, so that the temperature of the recording surface 2 gradually drops, the constituent atoms of the recording surface 2 crystallize, and the phase-change optical disk 1 is initialized. .

Initialization of the phase-change optical disk with a diameter of 130 mm was performed using the phase-change optical disk initialization device shown in FIG. 5, and the power supplied from the power supply unit to the xenon lamp was 800.
The phase change type optical disk was completely initialized at W and irradiation time of 120 seconds.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

For example, in the above-described embodiment, the phase change type optical disc 1
Although one and one xenon lamp are arranged, the number of phase-change optical disks and xenon lamps is not limited to one, and two or more may be arranged without any problem.

Further, as the heat source lamp which constitutes the initialization device for the phase change type optical disk of the present invention, not only the xenon lamp described in the embodiment but also other kinds of heat source lamps such as an infrared lamp can be applied.

Further, in the above-described embodiment, as a removing means for removing the radiant heat from the phase change type optical disk, an example using an elevator or a conveyor so as to form a distance between the xenon lamp which is a heat source lamp and the phase change type optical disk, and The example of turning off the light in order to remove the radiant heat itself has been described, but the present invention is not limited to this, or a combination of these may be used.

〔The invention's effect〕

The initialization method and apparatus for a phase-change optical disk of the present invention records by removing radiant heat from a heat source lamp arranged at a position where the entire recording surface of the phase-change optical disk is irradiated, from the phase-change optical disk. Since the entire surface can be gradually cooled after being heated to the crystallization temperature, and atoms on the entire recording surface can be crystallized all at once, so that the initialization can be performed in a short time.

[Brief description of drawings]

1 is a side view showing a first embodiment of the present invention, FIG. 2 is a graph for explaining the operation of the embodiment shown in FIG. 1, and FIG. 3 is a second embodiment of the present invention. FIG. 5 is a side view shown in FIG. 4, FIG. 4 is a graph for explaining the operation of the embodiment shown in FIG.
FIG. 7 is a side view showing a third embodiment of the present invention, FIG. 6 is a side view showing a conventional example, and FIGS. 7 (a) and 7 (b) are recording on the recording surface in the conventional example shown in FIG. 3 is a conceptual diagram showing a state and a graph showing initialization of a recording surface. 1 ... Phase change type optical disc, 2 ... Recording surface, 5 ... Xenon lamp, 6 ... Power supply device, 7 ... Elevator, 8 ... Pole, 9 ... Conveyor, 11 ... Semiconductor laser, 12 ... Condensing lens, 13 ... Cylindrical lens, 14 ... Objective lens, 21 ... Motor, a ... Radiant heat

Claims (2)

(57) [Claims] 1. A method of heating the entire recording surface of a phase-change optical disk to a temperature equal to or higher than a crystal temperature by radiant heat of a heat source lamp, and then gradually cooling the recording surface by removing the radiant heat from the phase-change optical disk. An initialization method for a phase-change optical disk, characterized in that the atomic arrangement is a crystal phase. 2. A heat source lamp disposed at a position for irradiating the entire recording surface of the phase change optical disk, and a removing means for removing radiant heat from the heat source lamp from the phase change optical disk. Characterizing phase change type optical disk initialization device.